Unit-4: Web technologies lecture notes

Unit-4: Web technologies lecture notes in Web technology - Subject uploaded at P.R.Engineering college

Unit-4: Web technologies lecture notes in Web technology - Subject at P.R.Engineering college uploaded by P.R.Engineering college Staff in lecturenotes.net

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UNIT IV
Representing Web Data
XML-Documents and Vocabularies-Versions and Declaration - Namespaces JavaScript and 
XML: Ajax-DOM based XML processing Event-oriented Parsing: SAX-Transforming XML 
Documents-Selecting XML Data:PATH-Template- based Transformations: XSLT-Displaying 
XML Documents in Browsers-Case Study- Rlated Technologies. Separating Programming and 
Presentation: JSP Technology Introduction-JSP and Servlets-Running JSP Applications Basic 
JSP-JavaBeans Classes and JSP-Tag Libraries and Files-Support for the Model-View-Controller 
Paradigm-Case Study-Related Technologies.
Representing Web Data: XML
XML
XML stands for eXtensible Markup Language, developed by W3C in 1996. XML 1.0 was 
officially adopted as a W3C recommendation in 1998. XML was designed to carry data, not to
display data. XML is designed to be self-descriptive. XML is a subset of SGML that can define
your own tags. A Meta Language and tags describe the content. XML Supports CSS, XSL, 
DOM.
The Difference between XML and HTML
1. HTML is about displaying information, where as XML is about carrying information. In
 other words, XML was created to structure, store, and transport information. HTML was
 designed to display the data.
2. Using XML, we can create own tags where as in HTML it is not possible instead it offers
 several built in tags.
3. XML is platform independent neutral and language independent.
4. XML tags and attribute names are case sensitive where as in HTML it is not.5. XML attribute values must be single or double quoted where as in HTML it is not
 compulsory
6. XML elements must be properly nested
7. All XML elements must have a closing tag
8. XML is used to create new internet languages. Here are some examples:
- WSDL for describing available web services
- WAP and WML as markup languages for handheld devices
- RSS languages for news feeds
- RDF and OWL for describing resources and ontology
- SMIL for describing multimedia for the web
Well Formed XML Documents
XML with correct syntax is "Well Formed" XML. XML validated against a DTD is "Valid" 
XML.
A "Well Formed" XML document must have the following correct XML syntax:
- XML documents must have a root element
- XML elements must have a closing tag
- XML tags are case sensitive
- XML elements must be properly nested
- XML attribute values must be quoted
Example for XML Document
<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me! </body>
</note>Xml document begins with XML declaration statement: <? xml version="1.0" encoding="ISO8859-1"?> . The next line describes the root element of the document: <note>. This element is
"the parent" of all other elements. The next 4 lines describe 4 child elements of the root: to, from,
heading, and body. And finally the last line defines the end of the root element : < /note>
XML Element
An XML element is everything from (including) the element's start tag to (including) the
element's end tag.
An element can contain:
- other elements
- text
- attributes
- Or a mix of all of the above...
XML vocabulary
XML vocabulary is used to defin

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Unit-4: Web technologies lecture notes

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Web technology - Subject

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P.R.Engineering college

Unit-4: Web technologies lecture notes

Unit-4: Web technologies lecture notes in Web technology - Subject uploaded at P.R.Engineering college

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